Use a single COPY command in dockerfiles for both *.sh and *.c for wrappers

Dockerfile

@@ -26,8 +26,7 @@ RUN ./build-llvm.sh $TOOLCHAIN_PREFIX && \
 ENV TOOLCHAIN_ARCHS="i686 x86_64 armv7 aarch64"
 
 # Install the usual $TUPLE-clang binaries
-COPY wrappers/*.sh ./wrappers/
-COPY wrappers/*.c ./wrappers/
+COPY wrappers/*.sh wrappers/*.c ./wrappers/
 COPY install-wrappers.sh .
 RUN ./install-wrappers.sh $TOOLCHAIN_PREFIX && \
     rm -rf /build